there are some fish species that will eat snails, like loaches, but i would NOT recommend getting any fish just because it will make your job easier unless you're willing to care for them in the long haul. i have albino dojo loaches and dwarf puffers (in separate tanks, of course) and they are so good at it that I've never had a snail problem and have started breeding snails to supplement their diet of flakes, a variety of frozen foods, bottom feeder wafers, Daphnia, and live worms.
you can try hand-picking them, altho they make such little eggs that those might be around, too. i've heard that putting a piece of lettuce in there and waiting for it to accumulate snails and then removing it, is a good way.
however, snails don't really hurt anything. they clean up leftovers and graze on algae. are you worried about their increasing your bioload?
